Limited conclusions can be drawn from this research as it is early stage, was conducted on a small number of people, and was not peer-reviewed. Larger studies that compare IVIG to other existing treatments for Alzheimer’s disease are required to determine how safe and effective the drug is.

And:

The research suggests that IVIG can slow down the progression of some of the symptoms of Alzheimer's but this certainly does not amount to a cure. It is unclear how long the beneficial effects of IVIG may last or whether everyone treated with IVIG would experience any benefits.

All these caveats are extremely important, given the Express' eye-catching and premature headline claim, plus the first line of the article, which states:

Alzheimer's sufferers and their devastated families were last night given new hope after scientists hailed the “most exciting” breakthrough yet in the search for a cure.

Given all the research that will need to take place over the next ten years or so, there's a very real danger that instead of giving 'new hope', such coverage gives only false hope.